Client side implementation of new /content-gs isolate protocol.

tests/isolateserver_test.py

Index: tests/isolateserver_test.py
diff --git a/tests/isolateserver_test.py b/tests/isolateserver_test.py
index 908c4b137d73fe476f66f70b14343de39a197df4..5245179592c1ef0245b7ef3d34050079663a7c06 100755
--- a/tests/isolateserver_test.py
+++ b/tests/isolateserver_test.py
@@ -114,6 +114,7 @@ class IsolateServerArchiveTest(TestCase):
   def setUp(self):
     super(IsolateServerArchiveTest, self).setUp()
     self.mock(isolateserver, 'randomness', lambda: 'not_really_random')
+    self.mock(isolateserver, 'ENABLE_GS_ISOLATE_API', False)
     self.mock(sys, 'stdout', StringIO.StringIO())
 
   def test_present(self):
@@ -298,6 +299,10 @@ class IsolateServerArchiveTest(TestCase):
 class IsolateServerDownloadTest(TestCase):
   tempdir = None
 
+  def setUp(self):
+    super(IsolateServerDownloadTest, self).setUp()
+    self.mock(isolateserver, 'ENABLE_GS_ISOLATE_API', False)
+
   def tearDown(self):
     try:
       if self.tempdir: